Season the pork loin with salt, pepper, and chili powder and place in the slow cooker.
Add the onion, garlic, green chiles, jalapeno, tomatoes, chicken broth, and cumin to the slow cooker.
Mix the ingredients together and spoon over top of the pork. Cover and cook on low for 8-10 hours.
When ready to serve, shred the pork, place back in the slow cooker and mix with the juices. Serve over top of rice.